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-rw-r--r--lib/system_win32.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/system_win32.h b/lib/system_win32.h
index ef83a512c..d2882fce1 100644
--- a/lib/system_win32.h
+++ b/lib/system_win32.h
@@ -52,7 +52,7 @@ typedef enum {
typedef unsigned int(WINAPI *IF_NAMETOINDEX_FN)(const char *);
/* This is used instead of if_nametoindex if available on Windows */
-IF_NAMETOINDEX_FN Curl_if_nametoindex;
+extern IF_NAMETOINDEX_FN Curl_if_nametoindex;
/* This is used to verify if we are running on a specific windows version */
bool Curl_verify_windows_version(const unsigned int majorVersion,